Surge immunity test of personal computer at power lines

This paper deals with problems arising at Electromagnetic Compatibility (EMC) in relation to the interference caused by surge voltages and currents. For this purpose, IEC 61000-4-5 Standard has been instituted, describing the procedure of testing and verification of a device for immunity against surge. Specifically, measurements and tests were performed on an investigation of surge immunity of a personal computer at power lines. Response of the testing computer under different coupling modes of the surges and different test levers were presented. The results implied that when the surges were applied between phases or the phase shifting was 90° or 270°, the tested personal computer´s surge immunity was lower. The information in this paper can also be used in the lightning protection design by the computer manufacturer.